• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.521-528
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• 1999

As the size of our industry and population inclose, the byproducts such as municipal solid wastes, industrial wastes are in the increasing phase. The treatment of such things is rising as a social problem. Today, the final disposal of these wastes depends mostly on the landfill, and the sanitary landfill is required and designed for preventing soil and groundwater contamination. Clays have been used for a liner material of a sanitary landfill, however, the high quality clay is hard to come by and quite expensive as a lining material in our country. Using the waste lime produced abundantly every year from chemical processes was studied here, made from the proper mixing of the bentonite and the waste lime meets the regulations from the USEPA. The soil property index tests (sieve analysis, specific gravity test Atterberg limit test) were performed, and at last to confirm the sorption characteristics of the bentonite and the waste lime the sorption isotherm equilibrium test and the sorption isotherm were performed with Toluene and Ethylbenzene which are the main components of the leachate from the landfill.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1717-1726
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• 2008

Vibration triaxial compression test was put in influence for liquefaction strength of fine grained soil of dredged and reclaimed ground and consideration for fine fraction content, relative density, overconsolidation ratio and plasticity index in this study. By the results of these test, the liquefaction strength increased with fine fraction content and the relative density, overconsolidation ratio incresed with liquefaction strength too. However, in the case of nonplastic silt was the smalist liquefaction strength which influenced by dilatancy and interlocking when silt content was 34.7%(average grading 0.12mm). Therefore, liquefaction strength of fine grained soil of dredged and reclaimed ground increased with fine fraction content so it will help to make lower liquefaction.

• 한국연초학회지
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• 제2권1호
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• pp.37-52
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• 1980

신개간지 토양에 대한 인산시용 수준별 석회, 퇴비증시, 퇴비와 붕소의 혼합시용에 따른 비옥도 증진의 효과가 연초의 수량 및 품질에 미치는 영향을 2년간에 걸쳐 시험한 결과를요약하면 다음과 같다. 1. 개량제 처리의 효과는 1차년도에서 보다 2차년도에 담배 생육과 엽면적지수와 단위엽 면적중을 월등하게 증가시켰다. 3. 개량제의 시용으로 초년도의 pH, 치환성염기등이 숙전과 같은 수준으로 개선되었으며, 처리별 비옥도 증진효과는 퇴비증시구가 컸다. 3. 2차년도 시험결과에서 수량은 대조구에 비하여 15∼25% 증수되었고, 품질은 처리간에 큰 차 없으나, 개량제 시용으로 대조구에 비하여 3 - 7% 향상되었다. 수익 (10a당 수납대금)은 인산흡수계수에 대한 3 %조절량+퇴비증시구가 가장 높아 대조구보다 34%의 증가를 가져왔다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제12권6호
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• pp.78-91
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• 2007

금번 연구에서 울산지역의 토지이용도에 따른 지하수 수질 및 오염특성을 파악하고, 지하수의 오염 정도를 평가하고 도면으로 시각화하는 방법인 오염지수를 산출하였다. 연구지역내 216개 시료에 대한 지하수의 화학조성은 매우 다양하게 나타나며, 전기전도도의 경우, $100{\sim}31,360\;{\mu}S/cm$로 매우 큰 변화를 보이고 있다. pH값은 $4.6{\sim}8.57$의 범위로 산성 내지 약알카리를 보이며 평균값은 7.0이다. 연구지역 지하수의 화학조성은 토지용도에 따라 많은 영향을 받는 것으로 해석되었다. 수질유형은 $Ca-HCO_3$, $Ca-Na-HCO_3$, 유형이 우세하며, 주거/상업지역과 공업지역 지하수의 경우는 농업지역과 녹지지역 지하수에 비해 Cl이 풍부한 (Na, Ca)-Cl 유형으로 변하고 있다. 연구지역 오염지수의 범위는 $1.1{\sim}117.6$으로 평균은 9.56으로 산출되었다.

• 한국농공학회논문집
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• 제48권7호
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• pp.73-86
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• 2006

Concentrated poultry production in the State of Alabama, U.S.A. results in excessive poultry litter. Application of poultry litter to pastures and row crops serves as a cheap alternative to commercial fertilizer. However, over the years, poultry litter application to perennial forage crops in the Appalachian Plateau region of North Alabama has resulted in phosphorus (P) buildup in soils. Phosphorus index (P-index) and comprehensive nutrient management plans (CNMP) are often used as a best management practice (BMP) for proper land application of litter. Because nutrient management planning is often not done for small animal feeding operations (AFOs), and also because, in case of excess litter, litter transportation infrastructure has not been developed, over application of poultry litter to near by area is a common practice. To alleviate this problem, optimal poultry litter management and transportation infrastructure needs to be developed. This paper presents a methodology to optimize poultry litter application and transportation through efficient nutrient management planning and transportation network analysis. The goal was accomplished through implementation of three important modules, a P-Index module, a CNMP module, and a transportation network analysis module within ArcGIS, a Geographic Information System (GIS). The CNMP and P-Index modules assist with land application of poultry litter at a rate that is protective of water quality, while the transportation network analysis module helps transport excess litter to areas requiring litter in the Appalachian Plateau and Black Belt (a nutrient-deficient area) regions. Once fully developed and implemented, such a system will help alleviate water quality problems in the Appalachian Plateau region and poor soil fertility problems in the Black Belt region by optimizing land application and transportation. The utility of the methodology is illustrated through a hypothetical case study.

• 농촌계획
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• 제12권2호
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• pp.49-56
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• 2006

The application of domestic wastewater on rice paddies results in the accumulation of sodium(Na$^+$) to the soil. Excessive concentration of sodium may cause the deterioration of the physical characteristics of the soil, change in the osmosis of the soil, destruction of soil aggregates as well as ion toxicity due to sodium accumulation. Using domestic wastewater as irrigation water should be preceded by measures to prevent or control the soil salinization caused by sodium. Agricultural reuse of domestic wastewater were found not to cause serious problems with food safety due to heavy metals. However, pre-treatment using ultraviolet or ozone is recommended to reduce the number of bacteria and gem and for public health reasons. Using domestic wastewater has shown that reducing the standard application of chemical fertilizers by as much as 50% reduced the harvesting index by only 10%. This study has shown that it is feasible to reuse domestic wastewater on rice paddies. In order to facilitate the application, it is deemed necessary to establish wastewater treatment technologies in the future, to review criteria for recycling domestic wastewater for agricultural purposes such as conditions of soil and cropping system and to resolve conflicts with farmers and public health issues.

• Journal of Ginseng Research
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• 제43권1호
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• pp.1-9
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• 2019

Background: Korean ginseng is an important cash crop in Asian countries. However, plant yield is reduced by pathogens. Among the Ilyonectria radicicola-species complex, I. mors-panacis is responsible for root-rot and replant failure of ginseng in Asia. The development of new methods to reveal the existence of the pathogen before cultivation is started is essential. Therefore, a quantitative real-time polymerase chain reaction method was developed to detect and quantify the pathogen in ginseng soils. Methods: In this study, a species-specific histone H3 primer set was developed for the quantification of I. mors-panacis. The primer set was used on DNA from other microbes to evaluate its sensitivity and selectivity for I. mors-panacis DNA. Sterilized soil samples artificially infected with the pathogen at different concentrations were used to evaluate the ability of the primer set to detect the pathogen population in the soil DNA. Finally, the pathogen was quantified in many natural soil samples. Results: The designed primer set was found to be sensitive and selective for I. mors-panacis DNA. In artificially infected sterilized soil samples, using quantitative real-time polymerase chain reaction the estimated amount of template was positively correlated with the pathogen concentration in soil samples ($R^2=0.95$), disease severity index ($R^2=0.99$), and colony-forming units ($R^2=0.87$). In natural soils, the pathogen was recorded in most fields producing bad yields at a range of $5.82{\pm}2.35pg/g$ to $892.34{\pm}103.70pg/g$ of soil. Conclusion: According to these results, the proposed primer set is applicable for estimating soil quality before ginseng cultivation. This will contribute to disease management and crop protection in the future.

• 농업과학연구
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• 제50권2호
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• pp.223-234
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• 2023

Appropriate fertilization methods are required according to species to supply necessary nutrients to plants and prevent soil environmental contamination in nurseries. In this study, the effects of nitrogen and phosphorus fertilization on the growth of Liriodendron tulipifera and soil characteristics were investigated. After 16 fertilization treatments (4 levels of nitrogen × 4 levels of phosphorus) were applied to one-year-old L. tulipifera seedlings at the Yongmun Nursery Station of the Korea Forest Service, height, root collar diameter (RCD), biomass, leaf nutrients, and soil characteristics were investigated. The height increased as the amount of nitrogen and phosphorus fertilization increased, and the RCD was the highest in the ×2 treatment. Biomass growth was on average 40.0% higher for the treatment with high nitrogen fertilization compared to the low nitrogen treatment. The seedling quality index was the highest with nitrogen and phosphorus ×2 treatment. Leaf phosphorus and magnesium concentrations decreased when nitrogen fertilization was applied, and leaf potassium concentrations decreased as nitrogen fertilization increased. Soil pH and exchangeable potassium decreased as the amount of phosphorus application increased, and exchangeable magnesium decreased as the amount of nitrogen application increased and increased as the amount of phosphorus application increased. Considering the growth of L. tulipifera seedlings and changes in the soil characteristics at the nursery stage, twice the standard fertilization amount is the appropriate fertilization amount for nursery of the Yongmun Nursery Station. It is expected that this study will contribute to improving nursery soil fertilization management technology for healthy seedling production.

• Spatial Information Research
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• 제3권1호
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• pp.1-18
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• 1995

호소나 하천들의 오염은 일반적으로 점원 오염과 비점원 오염으로 구분할 수 있다. 연구 대상지역인 충주호주변은 호소 주위 도시들의 하수나 공장폐수에 의한 점원 오염뿐만 아니라, 강우에 의한 토양 침식 등에 의하여 야기되는 비점원 오염이 수년전부터 아주 중요한 오염원으로 등장되고 있다. 본 연구에서는 충주호주변의 이러한 비점원 오염을 GIS를 이용하여 정량적으로 분석하였으며, 대상 환경정보들을 데이타베이스화하여 GIS지도모형연구를 실시하였다. 지표 유출량 분석이 이루어진 후, 토양 유실량 계산과 원격탐사기법을 이용한 호소의 녹조류 분석 등이 실시되었으며, GIS 를 이용하여 구현된 환경지질정보시스템에 의하여 종합 분석되었다. 본 연구는 한국자원연구소 환경지질연구그룹에서 시행하고 있는 환경지질도작성 연구사업의 일부이며, 금번 연구결과를 토대로 차년도의 목표에서는 호소주변 개발에 따른 자연환경 오염 최소화의 개발적지 선정과 호소주변 도시들의 확장, 발달에 의한 호소 환경오염 방지 대책이 연구될 것이다.

• 한국환경농학회지
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• 제35권2호
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• pp.87-96
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• 2016

BACKGROUND: The objective of this study is to evaluate the soil quality to cultivate crops in urban garden.METHODS AND RESULTS: During the period of six month from March to August 2015, measured eight heavy metals, seven Organic items and Fluorine on seventeen urban sites and thirty-one suburban sites in Gwangju city.METHODS AND RESULTS: The average concentration and range of heavy metal in soil are 0.15 mg/kg(ND-0.6) for Cd, 14.9 mg/kg(1.5-33.3) for Cu, 4.4 mg/kg(0.4-71.8) for As, 0.05 mg/kg(ND-1.366) for Hg, 24.7 mg/kg(13.1-62.7) for Pb, 102.5 mg/kg(49.1-276.4) for Zn and 9.2 mg/kg(ND-90.1) for Ni but Cr⁶⁺ is not detected. The average value and range of soil fertility items are 253.5mg/kg(76.6-1766.0) for fluorine, 6.4(4.8-7.7) for pH, 20.3 g/kg(5.0-44.0) for orangic matters, 562.7 mg/kg (28.0-1672.0) for available phosphate, 0.6 cmol⁺/kg (0.1-2.3) for K, 9.7 cmol⁺/kg (2.7-22.0) for Ca, 3.0 cmol⁺/kg (0.9-7.4) for Mg, 1.0 ds/m(0.2-2.9) for conductivity. The concentration of Hg in Suburban area is 0.005 mg/kg lower than 0.134 mg/kg in urban area. Also, the concentration of As, Cd, Ni and Zn is lower than urban area as 32%, 37%, 51%, 71% respectively.CONCLUSION: According to SPI index of soil contamination, 39 sites are first degree and 8 sites are second degree and 1 site(41th) is fourth degree. Pb and Cd are not detected and As is detected tiny amounts in plants grown polluted soil, so heavy metals have not moved to plants.